Hydraulic press



Feb. 4, 1941.

' R. w. DlNZL. HYDRAULIC PRESS Filed Aug. 4, 1939 2 Sheets-Sheet 1 I l II l ATTC FIN EY Feb. 4, 1941. R. w. DINZL HYDRAULIC mass File'd Aug. 4,1939 2 Sheets-Sheet 2 INVENTO R MardWfiUgZ B ATTORNEY Patented Feh 41911 uNiTEo sures.

PATENT HYDRAULIC PRESS Richard W. Dinzl, Westfleld, N. .l., assignor toThe Watson-Stillman Co., Roselle, N. 5., a corporaticn of New JerseyApplication some 4,

4- Claims.

piece so shaped as to dispose the load or stress of the work resistanceoff-center with respect to the press heads or platens operating upon thework. Inthat case the powerful ofi-center stress sometimes cants a presshead slightly, with con sequent damage to the dies, the work. or both.Methods of correcting this defect have been proposed but heretofore theyhave involved complications in the press structure which areobjectionable in operation and add materially to the cost of the press.I i

Animportant object of the present invention is to provide simple,inexpensive and entirely satisfactory means for preventing the saidtilting of a press head under-the stress of oil-center work resistance.

Other objects of inafter. 4

In the drawings; Fig. 1 is a vertical sectional view of a pressembodying the invention, the section being on the line l-.-i of Fig. 3;

Fig. 2 is an enlarged detail vertical section on the line 2-2 of Fig. 4;

Fig. 3 is a side view of the pres;

Fig. 4 is anenlar'ged horizontal section on the line 4- of Fig. 3; and

Fig. 5 is a view similar to Fig. 2, showing a modified form of the presshead guiding means.

The invention is shown as embodied in a press having a fixed lower presshead and a cooperating upper press head reciprocable vertically byhydraulic pressure.- The press includes a rigid frame whose structurecomprises a lower tlBJlS-r verse frame member or base 1, columns 2 borneby the base, at opposite sides of the press heads,

'a transverse frame member-3 supported by the columns in a positionabove thepress heads, a

transverse frame member 4 spaced above the member 3, and four strainrods 5 to anchor together all of said parts of the frame.- Base lcomprises a flat casting bearing upon its upper face a flat bolsterplate 8 which forms in effect the fixed lower press head or platen. Eachcol-Q hold the latter against endwise displacement on IS the columns.Another pair'of keys 0 at right Often,

the invention will appear here-- A pair of was, SBli'iitiNfi. sensesangles to the first pair are also inserted in keyways in said abuttingsurfaces and hold the member Sagainst sidewise displacement on thecolumns. At their lower ends the columns are similarly keyed to thebase. The strain rods extend through holes in the base, the framemember'd and the frame member t and have nuts 9 screwed upon their upperand lower ends to anchor together all of the frame parts. Between theframe members 8 and 5, rigid spacing sleeves iii encircle the strainrods and support the memher t properly spaced above the member 3.

An upper press heador platen ii comprising a rigid casting is mountedfor vertical reciprocaa tionbetween the columns 2. Between each columnand the adjacent side of said press head there are guide means forvthehead. Each columnis formed with a pair of square corners adjacent thepress head and basis, at said corners, rigid guide strips 52. Each ofthe latter is bevwhich faces obliquely inwardlytoward the press head.A-rigid flange M formed on the guide face l3. Between'said guide memberand the face it there is fitted a companion wedge-shaped guide member inhaving a vertical guide face 2|.

slidably fitting againstthe faceie and an inclined. face 22 hittingagainst the inclined face of guide member iii. The latter member has arounded protuberance is rotatably fitting in a rounded cavity 2% in thesurface ii to enable the guide members to be accurately trued to thesurface' it. Between said companion guiding members there is a screwconnection 25 for vertically adjusting the member 2d guide face it,Above the press head ii and centered thereon cylinder is a hollowcasting vertically arranged a and formed at its lower end with a baseflange 21 which bears against the upperside of the press to accuratelyfit the 20 eled to provide it with a vertical guide face it c5 there isa hydraulic pressure cylinder 26. This I head II and is bolted thereto,as at 26, to make the cylinder and presshead a rigid, reciprocable unit.The cylinder casting is formed with a partition 29 at an intermediatepoint, and the por-,

upper end the plug is screw-threaded and has a nut 33 screwed thereonand bearing against an abutment surface on the member 4 around the upperend of the bore 3|. The plug has an axial bore 34 for admitting fluidpressure to the cylinder to act upon the partition 23 and force thecylinder and press head II downward on a work- -ing stroke. The bore 3|containing the reduced portion of the plug is preferably slightly largerthan said portion to enable lateral adjustment of the plug to center itwithin the cylinder.

The cylinder casting 26 is much longer than the stroke of the press headI I and it extends upward through a vertical bore 35 in the frame member3. This bore is materially larger than the cylinder casting and hasfitted therein a rigid annular guide 36 for the cylinder. The bore ofthis guide and the peripheral surface of the its stroke.

cylinder are finished smooth and they have a snug sliding fit. At itslower end the guide has a flange 31 bolted to the under side 'of theframe I member 4, as at 38. Y

The cylinder guide '36, the cylinder casting 26, the press head guidemembers 20 and the fixed guide members I2 borne by the frame columns areso formed'and arranged that the most remote guiding points of the guide36 andthe guides 20, that is, the highestpoint of engagement of theguide 36 with the cylinder casting and the lowest point of engagement ofthe guides 2li with the fixed guide surfaces I3, are spaced along thevertical line of reciprocation of press head I I a distance at leastequal to the major dimension of the working face area of said presshead. By working face area is meant the maxi: mum area practicallyavailable at the under face of the press for bearing a die forcooperation with a die on the companion-lower press head 6. The

guides 36 and 20 are of material length along the line of reciprocation,and the length of the guiding surface of the cylinder and that of thefixed guide surfaces I3 is such that theentire length of guide 36 and ofguides 20 will be in guiding engagement with said surfaces respectivelyin all positions of the press head II along The means shown anddescribed for guiding the reciprocable press head and cylinder unit willpositively resist tilting of the press head under the stress ofoff-center work resistance due to non-symmetrical arrangement of thework with reference to the axial line of the press cylinder or thecenter of the press head. The wide spacing of the cylinder guide 36 fromthe guides 20 along the line of reciprocation provides the guide 36cooperating dies thereon. Said means and the dies are here omitted fromthe drawings in order to simplify the illustration. For the same reason,means for supplying hydraulic pressure to the bore 34 delivering to thepress cylinder, and

means for controlling the pressure in the cylinv der, are omitted fromthe drawings. I

For retracting or elevating the press head II the press is provided withthe usual hydraulic pull-back cylinders .39 and pistons 40. Saidcylinders are supported by the press frame memher 3, and the pistons areoperatively connected by rods 4| to the press head I I. By admission ofhydraulic pressure to the cylinders, at the under side of the pistons,the press head is raised. Any suitable means, not shown, may be employedto supply and control hydraulic pressure in the pull-back cylinders.

Fig. 5 shows another form of press head guiding means, simpler than thatshownin Figs. 2 and 4, for cooperation with the fixed guides I2. Asingle guide strip 20 is fitted within each of the,corner channels I6 ofthe press head II, and is formed to fill the space between the bottomface of the channel and the fixed guide face I3.

What I claim is: I

. 1. In a press, the combination of a rigid lower press head, atransverse upper frame member and vertical side frame'members rigid withthe transverse member, a vertically arranged-press head guiding meansbelow the upper transverse member and located at the outer margin of thereciprocable head, a verticai press-cylinder rigid with the reciprocablepress .head and centered thereon and extending upwardly from the uppersurface thereof and through the said upper frame me'm-,

her and adapted to receive ,fiuid pressure, said 7 cylinder beingsmaller in diameter than the transverse dimension of the saidreciprocable head, rigid annular means borne by said upper frame memberand extending around said cylinder and having a long bearing on theexterior thereof, the cylinder extending through and above said guidemeans to guide the cylinder in its reciprocation with the upper presshead; a fluid pressure reaction plug borne by the frame in a fixedcentral position above the said upper frame member and extending downinto. the

upper end of the cylinder and along which the tances outward from theaxis of the cylinder,

the guiding means for the press head being the lowermost'and at. thegreatest distance outward from the cylinder axis and the uppermost ofsaid guiding means being the shortest distance outward from said axis.

2. In a press, the combination of a rigid "press frame comprising atransverse lower frame member bearing a lower head, a-transverse upperframe member, and vertical side frame members rigid with the transversemembers, a vertically reciprocable rectangular upper press head,vertically arranged press head guiding means below the upper transversemember and between the vertical frame members and located at the fourcorners of the reciprocable head the engaged faces of said guide meansin horizontal section aasopsa pressure for moving both the cylinder andthe upper head downward on a working stroke, said cylinder being smallerin diameter than the transverse dimension of the said reciprocable head,rigid annular guide means borne by said upper frame member and extendingaround said cylinder and having a long bearing on the exterior thereof,the cylinder extending through and above said guide means to guide thecylinder in its reciprocation with the upper press head; a fluidpressure reaction plug borne by the frame in a fixed central positionabove the said upper frame member and extending down into the upper endof the cylinder and along which the cylinder is slidable; annular fluidpressure retaining and rigid annular cylinder guiding means carried bythe cylinder at the upper end thereof and between the cylinder and saidplug, said fluid pressure retaining and cylinder guiding means beingsmaller in diameter than the said annular guiding means engaging theexterior of the cylinder, whereby the reciprocablepress head and thecylinder will be guided by three guiding means spaced apart verticallyand located different distances outward from the axis of the cylinder,the guiding means for the press head being the lowermost and at thegreatest distance outward from the cylinder axis and the uppermost ofsaid guiding means being the shortest distance outward from said axis.

3. In a press, thecombination of a rigid press frame comprising atransverse lower frame member bearing a lower head, a transverse upperframe member, and vertical side frame members rigid with the transversemembers, a vertically reclprocable rectangular upper press head,vertically arranged press head guiding means below the upper transversemember and between the vertical frame members and located at the fourcorners of the reciprocable head the engaged faces of said guide meansin horizontal section being in planes approximately forty-five degreesto a vertical plane extending centrally and longitudinally of the press,adjustable wedge means between the vertical edges of the press head andthe said vertical guiding means, a vertical press cylinder rigid withthe reciprocable press head and centered thereon and extending upwardlyfrom the upper surface thereof and through the said upper frame memberand adapted to receive fluid pressure for moving both the cylinder andthe upper head downward on a working stroke, said cylinder being smallerin diameter than the transverse dimension of the said reciprocable head,an annular means borne by said upper frame member and extending aroundsaid or!- inder and having a long bearing on the exterior thereof, thecylinder extending through and above said guide means to guide thecylinder in its reciprocation with the upper press head; a fluidpressure reaction plug borne by the frame in a fixed central positionabove the said upper frame member and extending down into the upper endof the cylinder and along which the cylinder. is slidable; annular fluidpressure retaining and rigid annular cylinder guiding means carried bythe cylinder at the upper end thereof and between the cylinder and saidplug, said fluid pressure retaining means being smaller in diameter thanthe said annular guiding means engaging the exterior of the cylinder,whereby the reciprocable press head and the cylinder will be guided bythree vertically spaced guiding means located diflerent distancesoutward from the axis of the cylinder, the lowermost of said guidingmeans being the greatest distance outward from the cylinder axis and theuppermost of said guiding 20' means being the shortest distance outwardfrom said axis. g

4. In a press, the combination of a rigid lower press head, a transverseupper frame member and vertical side frame members rigid with thetransverse member, a vertically arranged press head guiding means belowthe upper transverse memthe vertical edges of the press head and thesaid vertical guiding means, a vertical'press cylinder rigid with the,reciprocable press head and center ed thereon and extending upwardlyfrom the upper surface thereof and through the said upper frame memberand adapted to receive fluid pressure, said cylinder being smaller indiameter than the transverse dimension of the said reciprocable head,rigid annular means borne by said upper frame member and extendingaround said cylinder and having a long bearing on the exterior thereof,the cylinder extending through and above said guide means to guide thecylinder in its reciprocation with the upper press head; a fluidpressure reaction plug borne by the frame in a fixed central positionabove the said upper frame member and extending down into the upper ends' of the cylinder and along which the cylinder is slidable; annularfluid pressure retaining and rigid annular cylinder-guiding meanscarried by the cylinder at the upper end thereof and between thecylinder and said plug, said fluid pressure retaining and cylinderguiding means being smaller in diameter than the said annular guidingmeans engaging the exterior of the cylinder, whereby the reciprocablepress head and the cylinder will be guided by three vertically spacedguiding means located different distances outward from the axis of thecylinder, the guiding means for the press head being the lowermost andat the greatest distance outward from the cylinder axis and theuppermost of said guiding means being the shortest distance outward fromsaid axis. 4

RICHARD W. IDINZL.

